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Yamada, Susumu
no journal, ,
no abstracts in English
Seki, Akiyuki; Suzuki, Kenta; Takahashi, Yoshitomo; Matsubara, Takeshi; Suto, Shigeo; Saito, Kimiaki; Takemiya, Hiroshi; Murakami, Haruko*
no journal, ,
After the Fukushima Daiichi Nuclear Power Plant accident, a lot of monitoring studies had been conducted to collect the precious data which are important for the estimation and prediction of the radionuclide distribution. However, those monitoring databases were not convenient for users because their formats were not unified and they are provided as PDF files. Moreover those databases ware published on the independent websites operated by each organization. JAEA developed the database which provides the monitoring data in an unique format on the same website. The database provides not only numerical data but also visualization data following users' needs.
Miyamura, Hiroko; Kaburagi, Masaaki; Sato, Yuki; Kawamura, Takuma; Idomura, Yasuhiro; Torii, Tatsuo
no journal, ,
We introduce a project that constructs the 
ray remote visualization system for capturing the distribution of radiation sources, which were released from the Fukushima Daiichi Nuclear Power Plant. This project executes measurements using a Compton camera mounted on a drone. The measurement datasets are reconstructed for visualizing the radiation source distribution. In this report, we investigated the accuracy of reconstruction for measurement datasets with the constraints, using a three-dimensional back-projection method and a list-mode maximum likelihood estimation method. The measurement datasets are generated by Compton camera measurement simulations for point ray sources, where the number and angle of Compton projection are limited. The reconstruction numerical experiments show that the source distribution data can be reconstructed if the number of projections is sufficiently high.